Southern California -- this just in

A running gun battle in Monterey Park on Sunday left a police officer and two bystanders wounded and a suspect dead as a SWAT team surrounded an apartment building where a second assailant was believed to be hiding, officials said. [Updated at 11:30 p.m.: A search turned up nothing, officials said.]

The unidentified Monterey Park Police Department officer was hospitalized for treatment of a non-life-threatening injury, according to the Los Angeles County Sheriff’s Department. The conditions of the bystanders were not immediately available.

The shooting occurred about 5 p.m. after officers responded to the report of a stabbing stemming from a road rage incident at South Garfield and Newmark Avenues, a busy commercial area, officials said. The condition of the stabbing victim was not known. The incident could have been the result of an earlier hit-and-run crash, officials said.

A resident, who asked that her name not be used, said she heard “a lot of shots” and officers ordering someone to “put the gun down.”

Monterey Park Police Capt. Eugene Harris said officers shot and fatally wounded one suspect after he opened fire on them. “It was a very chaotic,” Harris said. “There were people everywhere.” He said he did not know if the wounded bystanders had been involved in the hit-and-run or stabbing.

After the shooting, police officers and sheriff’s deputies flooded the area, with helicopters hovering above. Three hours later, the SWAT team remained deployed around the apartment building on Newmark, across the street from a CVS pharmacy. Officials said they believed the other suspect was holed up in the building.